The Dortmund "Borussia" club wants London's "Chelsea" to win in the battle for their striker Roberto Lewandowski against Munich's "Bayern" team.
Dailystar.co.uk reports that the German team has already informed the "Blues" that they would even be willing to accept attacking midfielder Kevin De Bruyne.
Dortmund, who will face Bayern in the Champions League final on May 25, does not want to give up their star to the Munich team, as it would give them an even greater advantage in the Bundesliga battles.
Therefore, "Borussia" is trying to increase Chelsea's interest in the £25 million-rated Pole, who is also wanted by Manchester United.
The hope of "Borussia" is also boosted by the fact that Real Madrid coach Jose Mourinho, who may move to the Chelsea team in the summer, is a fan of the 24-year-old striker.